Effect of internal heat recovery in ammonia-water absorption cooling cycles: exergy and structural analysis
MetadataShow full item record
First and second law analysis have been conducted for three low temperature driven ammonia-water absorption cooling cycles with increasing internal heat recovery. Based on the results of exergy analysis the structural analysis has been achieved. The obtained Coefficients of Structural Bonds (CSB) consider how the irreversibility of the whole cycle is affected by a change in the irreversibility related to an efficiency improvement of a single component. Trends for the different configurations are similar, while quantitative differences among the main heat exchangers are considerable. The highest values of the CSB are found for the refrigerant heat exchanger. Also the evaporator, the condenser, the generator and the absorber show values higher than unity. The lowest CSB’s are obtained in the solution heat exchanger. In general, CSB’s decrease with increasing efficiency. That means that for very efficient heat exchangers, a further improvement looks less attractive. The dephlegmator is an exception as it shows a singularity of the CSB value due to its complex interactions with the other components. Once the CSB’s are obtained for the main components, they can be used in the structural method of the thermoeconomic optimisation. This method enables us to find the optimum design of a component in a straightforward calculation.
Is part ofInternational Journal of Thermodynamics, 2009, vol.12, núm.1, p.17-27
European research projects
Showing items related by title, author, creator and subject.
Exergy and structural analysis of an absorption cooling cycle and the effect of efficiency parameters Boer, Dieter; Medrano Martorell, Marc; Nogués Aymamí, Miquel (International Centre for Applied Thermodynamics, 2005)Absorption cycles are an alternative to compression cycles in cooling and refrigeration applications. Our analysis of an absorption cycle is based on the exergy and the structural analysis. Once the exergy analysis has ...
Gebreslassie, Berhane Hagos; Medrano Martorell, Marc; Boer, Dieter (Elsevier, 2010)An exergy analysis, which only considers the unavoidable exergy destruction, is conducted for single, double, triple and half effect Water–Lithium bromide absorption cycles. Thus, the obtained performances represent the ...
Theoretical analysis of a novel integrated energy system formed by a microturbine and a exhaust fired single-double effect absorption chiller Medrano Martorell, Marc; Mauzey, Josh; McDonell, Vince; Samuelsen, Scott; Boer, Dieter (International Centre for Applied Thermodynamics, 2006)Integrated Energy Systems (IES) combine a distributed power generation system (DG) such as a microturbine generator (MTG) or a fuel cell with thermally activated technologies (TAT) such as absorption cooling. This integration ...